hello, please start by [[Reset Firefox – easily fix most problems|resetting firefox]], which should address the "outdated" message... in order to get rid of yahoo, please go to ''firefox > addons > extensions'' & remove the toolbar. <br>also go to the windows control panel / programs and remove all toolbars or potentially unwanted yahoo software from there. <br>finally, run a full scan of your system with different security tools like the [http://www.malwarebytes.org/products/malwarebytes_free free version of malwarebytes] & [http://www.bleepingcomputer.com/download/adwcleaner/ adwcleaner]. [[Remove a toolbar that has taken over your Firefox search or home page]]